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author:

Weng, Wei-Xiang (Weng, Wei-Xiang.) [1] | Cao, Jian-liang (Cao, Jian-liang.) [2] | Lin, Hui-ling (Lin, Hui-ling.) [3] | Li, Qiang (Li, Qiang.) [4] (Scholars:李强)

Indexed by:

EI Scopus SCIE

Abstract:

Acoustic emission (AE) monitoring was used during indentation tests on the cross section of plasma-sprayed 8 wt.% yttria-stabilized zirconia (8YSZ) thermal barrier coatings to investigate the relationship between AE signals and the associated deformation or single cracking events. The damage evolution in 8YSZ was studied by examining signal characteristics with the aid of AE parameter analysis and wavelet packet decomposition. The results show that the coatings were firstly elasto-plastically deformed, and microcracks gradually developed around the indentation. Then, delamination occurred and the fracture was made up of some longer cracks and dozens of microcracks. AE signals originating from coating deformation, formation of microcracks and longer cracks show different amplitudes and frequencies. The results indicate that the features of AE parameters differ depending on the mechanical failure mechanism, and AE responses are closely related to the fracture behavior and are dependent on splat microstructure of the coatings.

Keyword:

acoustic emission signal mechanical failure mechanism microstructure thermal barrier coatings wavelet packet decomposition

Community:

  • [ 1 ] [Weng, Wei-Xiang]Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350116, Fujian, Peoples R China
  • [ 2 ] [Cao, Jian-liang]Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350116, Fujian, Peoples R China
  • [ 3 ] [Li, Qiang]Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350116, Fujian, Peoples R China
  • [ 4 ] [Lin, Hui-ling]Fujian Normal Univ, Coll Math & Informat, Fuzhou 350117, Fujian, Peoples R China

Reprint 's Address:

  • 翁卫祥

    [Weng, Wei-Xiang]Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350116, Fujian, Peoples R China

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Source :

JOURNAL OF THERMAL SPRAY TECHNOLOGY

ISSN: 1059-9630

Year: 2019

Issue: 7

Volume: 28

Page: 1651-1663

2 . 5 2 2

JCR@2019

3 . 2 0 0

JCR@2023

ESI Discipline: MATERIALS SCIENCE;

ESI HC Threshold:236

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 2

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 3

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